#include "Util.h"
#include <sys/time.h>
#include <netdb.h>
#include <string.h>
#include <arpa/inet.h>

int HostLookup(char *IP, const char *hostname)
{
  struct addrinfo hints;
  struct addrinfo *serverinfo = NULL;
  struct in_addr addr;
  memset(&hints, 0, sizeof(hints));
  hints.ai_flags = AI_CANONNAME;
  hints.ai_family = AF_INET;
  int ret = getaddrinfo(hostname, NULL, &hints, &serverinfo);
  if((ret != 0) || (serverinfo == NULL)) {
    strcpy(IP, hostname);
    return -1;
  }
  sockaddr_in *sa;
  sa = (sockaddr_in *)serverinfo->ai_addr;
  addr.s_addr = sa->sin_addr.s_addr;      
  freeaddrinfo(serverinfo);
  inet_ntop(AF_INET, &addr, IP, 16);
  return 0;
}

void milsleep(int ms)
{
  struct timeval tv;
  tv.tv_sec = ms/1000;
  tv.tv_usec = (ms%1000)*1000;
  select(0, 0, 0, 0, &tv);
}

//bit_empty: INOUT
//           IN: empty bit in the first bytes of dst
//           OUT: empty bit in last bytes of dst
//dst: IN : dst start addr
//src: IN : src start address at Byte boundary
//numBits: IN : totol number of bits to copy
//return: end of dst
 
unsigned char *bits_copy(int &bit_empty, unsigned char *dst,
			 unsigned char *src, int numBits)
{
  int bit_used = 8-bit_empty;
  unsigned char mask_empty = (1<<bit_empty) - 1;
  unsigned char mask_used = ~mask_empty;
  unsigned char tmps;
  unsigned char tmpd;
  int numBytes = numBits>>3;
  int leftBits = numBits&0x7;
  tmpd = dst[0] & mask_used;
  for(int i=0; i<numBytes; i++) {
    tmps = src[i];
    tmpd |= tmps>>bit_used;
    dst[i] = tmpd;
    tmpd = tmps<<bit_empty;
  }
  unsigned char *newDst = 0;
  if(leftBits) {
    if(leftBits == bit_empty) {
      dst[numBytes] = tmpd | src[numBytes]>>bit_used;
      bit_empty = 8;
      newDst = &dst[numBytes+1];
    }
    else if(leftBits < bit_empty) {
      dst[numBytes] = tmpd | src[numBytes]>>bit_used;
      bit_empty -= leftBits;
      newDst = &dst[numBytes];
    }
    else {
      dst[numBytes] = tmpd | src[numBytes]>>bit_used;
      dst[numBytes+1] = src[numBytes] << bit_empty;
      bit_empty = 8-(leftBits - bit_empty);
      newDst = &dst[numBytes+1];
    }
  }
  else {
    dst[numBytes] = tmpd;
    newDst = &dst[numBytes];
  }
  return newDst;
}

//bit_valid: INOUT
//           IN: # of valid low bits in the first bytes of src
//           OUT: # of valid low bits in last bytes of src
//dst: IN : dst start addr at Byte boundary
//src: IN : src start addr
//numBits: IN : totol number of bits to copy
//return: end of src
 
unsigned char *bits_shift(int &bit_valid, unsigned char *dst,
			 unsigned char *src, int numBits)
{
  int bit_used = bit_valid;
  int bit_empty = 8-bit_used;
  int numBytes = numBits>>3;
  int leftBits = numBits&0x7;
  for(int i=0; i<numBytes; i++) {
    dst[i] = (src[i]<<bit_empty) |
      (src[i+1]>>bit_used);
  }
  unsigned char *newDst = 0;
  if(leftBits) {
    if(leftBits == bit_used) {
      dst[numBytes] = src[numBytes] << bit_empty;
      bit_valid = 8;
      newDst = &src[numBytes+1];
    }
    else if(leftBits < bit_used) {
      dst[numBytes] = src[numBytes] << bit_empty;
      bit_valid = bit_used-leftBits;
      newDst = &src[numBytes];
    }
    else {
      dst[numBytes] = src[numBytes] << bit_empty |
	(src[numBytes+1]>>bit_used);
      bit_valid = 8-(leftBits-bit_used);
      newDst = &src[numBytes+1];
    }
  }
  else {
    bit_valid = bit_used;
    newDst = &src[numBytes];
  }
  return newDst;
}

/* shift the whole array to left by iOffset bits (0=<iOffset<8) */
                                                                                
void bitLeftShift(unsigned char *cArray,const int iLen,const int iOffset){
  unsigned char cTemp,cTemp1;
  unsigned char cOne;
  int i;
  cOne = ~0;
  for(i=0;i<iLen-1;i++){
    cTemp = (*(cArray+i)) << iOffset;
    cTemp1 = *(cArray+i+1);
    cTemp1 = cTemp1 & (cOne<<(8-iOffset));
    *(cArray+i) = cTemp|(cTemp1>>(8-iOffset));
  }
  *(cArray+i) = (*(cArray+i)) << iOffset;
}
/* shift the whole array to right by iOffset bits (0=<iOffset <8)
   iLen < sizeof(*cArray) */

void bitRightShift(unsigned char *cArray,const int iLen,const int iOffset){
  unsigned char cTemp,cTemp1;
  unsigned char cOne;
  int i;
  cOne = ~0;
  cTemp = *(cArray+iLen-1) & (cOne>>(8-iOffset));
  if(cTemp!=0)
    *(cArray+iLen) = cTemp <<(8-iOffset);
  for(i=iLen-1;i>0;i--){
    cTemp = *(cArray+i-1) &(cOne>>(8-iOffset));
    cTemp1 = *(cArray+i) >>iOffset;
    *(cArray+i) = (cTemp <<(8-iOffset))|cTemp1;
  }
  *cArray = *cArray >> iOffset;
}

unsigned short crc16(unsigned char *src, int numBytes, unsigned int poly, unsigned int init, unsigned int close)
{
  unsigned int crc = init;
  unsigned int data = 0;
  for(int i=0; i<numBytes; i++) {
    data = src[i]<<8;
    for(int j=0; j<8; j++) {
      crc<<=1;
      data<<=1;
      if((data^crc) & 0x10000) {
	crc = crc ^ poly;
      }
    }
  }
  crc = crc ^ close;
  return (unsigned short)crc;
}

unsigned short crc16_l(unsigned char *src, int numBytes, unsigned int poly, unsigned int init, unsigned int close)
{
  unsigned int crc = init;
  unsigned int data = 0;
  for(int i=0; i<numBytes; i++) {
    data = src[i];
    for(int j=0; j<8; j++) {
      if((crc^data) & 0x1) {
	crc = (crc>>1) ^ poly;
      }
      else {
	crc>>=1;
      }
      data>>=1;
    }
  }
  crc = crc ^ close;
  return (unsigned short)crc;
}

unsigned int crc32_l(unsigned char *src, int numBytes, unsigned int poly, unsigned int init, unsigned int close)
{
  unsigned int crc = init;
  unsigned int data = 0;
  for(int i=0; i<numBytes; i++) {
    data = src[i];
    for(int j=0; j<8; j++) {
      if((crc^data) & 0x1) {
	crc = (crc>>1) ^ poly;
      }
      else {
	crc>>=1;
      }
      data>>=1;
    }
  }
  crc = crc ^ close;
  return crc;
}

static unsigned short fcstab[256] = {
  0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
  0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
  0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
  0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
  0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
  0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
  0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
  0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
  0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
  0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
  0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
  0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
  0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
  0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
  0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
  0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
  0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
  0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
  0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
  0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
  0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
  0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
  0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
  0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
  0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
  0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
  0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
  0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
  0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
  0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
  0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
  0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};

/**********************************************************************
*%FUNCTION: pppFCS16
*%ARGUMENTS:
* fcs -- current fcs
* cp -- a buffer's worth of data
* len -- length of buffer "cp"
*%RETURNS:
* A new FCS
*%DESCRIPTION:
* Updates the PPP FCS.
***********************************************************************/
unsigned short pppFcs16(unsigned short fcs, unsigned char *cp, int len)
{
  while(len--)
    fcs = (fcs >> 8) ^ fcstab[(fcs ^ *cp++) & 0xff];
  return (fcs);
}
